Add README

README.md

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+totptool
+========
+
+Tooling for generating and managing large numbers of TOTP secrets.
+
+```console
+$ totptool
+Usage: totptool [options] <command> [args]
+
+Options:
+    -h --help       Show this screen
+    -r --root:path  Use path as the totp root for secrets
+    -v --version    Show version of totptool
+
+Subcommands:
+    code <name>
+                    Generate a two-factor auth code for <name>
+
+    gen <name>
+                    Generate a new two-factor auth secret for
+                    <name>
+
+    ls
+                    List all the names of the secrets that
+                    totptool tracks
+```
+
+Because I wrote this for me and I can say whatever I want as the arbitrary
+demands, I have it storing all TOTP secrets in my common synced folder
+`~/life`. Edit the code or use `--root` to change this.
+
+Lifecycle
+---------
+
+`totptool gen <name>` -> `totptool code <name>`
+
+```console
+$ totptool code $(totptool ls | dmenu) | xclip -sel clip
+```